appvm/appvm.sh

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#!/bin/bash
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APPVM_PATH=$(dirname $(realpath $0))
cd ${APPVM_PATH}
if [ ! -f nix/local.nix ]; then
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echo "[*] There is no local.nix, creating."
echo -e "{\n}" >> nix/local.nix
fi
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if [[ "$1" == "build" && "$2" != "" ]]; then
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if [ -f bin/appvm.${2} ]; then
echo "[*] Kill app."
pkill -f "$(cat bin/appvm.${2} | grep pgrep | awk '{ print $3 }')"
fi
if [ -f qemu/qcow2/${2}.qcow2 ]; then
echo "[*] Remove old app state."
rm qemu/qcow2/${2}.qcow2
fi
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NIX_PATH=$NIX_PATH:. nix-build '<nixpkgs/nixos>' -A config.system.build.vm -I nixos-config=nix/${2}.nix || exit 1
NIX_SYSTEM=$(realpath result/system)
mkdir -p bin
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RAND_HASH=$(head /dev/urandom | md5sum | awk '{ print $1 }')
VM_BIN_PATH=$(realpath qemu/bin/qemu.${RAND_HASH}.${2})
sed "s;NIX_SYSTEM_PLACEHOLDER;${NIX_SYSTEM};" qemu/qemu.template > ${VM_BIN_PATH}
sed -i "s;NAME_PLACEHOLDER;${2};" ${VM_BIN_PATH}
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sed -i "s;HASH_PLACEHOLDER;${RAND_HASH};" ${VM_BIN_PATH}
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sed -i "s;NIX_DISK_IMAGE_PLACEHOLDER;${APPVM_PATH}/qemu/qcow2/${2}.qcow2;" ${VM_BIN_PATH}
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RANDOM_PORT=$(/usr/bin/python -c 'import random; print(random.randint(1024,65535))')
# TODO Check for port collisions
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sed -i "s;PORT_PLACEHOLDER;${RANDOM_PORT};" ${VM_BIN_PATH}
echo -e "#!/bin/bash\npgrep -f ${RAND_HASH} || {\n\tnohup setsid ${VM_BIN_PATH} >/dev/null 2>&1 &\n\tsleep 1s\n}\nremote-viewer -f spice://127.200.0.1:${RANDOM_PORT}" > bin/appvm.${2}
chmod +x ${VM_BIN_PATH}
chmod +x bin/appvm.${2}
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unlink result
elif [[ "$1" == "generate-resolution" && "$2" != "" && "$3" != "" ]]; then
MONITOR_SIZE="$(xrandr | grep mm | head -n 1 | awk '{ print $(NF-2) " " $(NF) }' | sed 's/mm//g')"
CVT="$(cvt ${2} ${3} | grep Modeline)"
echo "{"
echo " services.xserver.monitorSection = ''"
echo " " ${CVT}
echo " " Option '"PreferredMode"' $(echo ${CVT} | awk '{ print $2 }')
echo " " DisplaySize ${MONITOR_SIZE} # In millimeters
echo " '';"
echo "}"
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else
echo -e "Usage:\t$0 build APPLICATION"
echo -e "or:\t$0 generate-resolution X Y"
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fi